What is the first step in producing a transgenic animal?

A. inject the desired gene(s) into a donor egg
B. transgenic organism produces offspring that have the desired gene which can then produce more transgenic offspring
C. implantation of a donor egg into the host mother
D. transgenic eggs are harvested from the surrogate mother


Answer: A

Biology & Microbiology

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An action potential begins in a neuron's trigger zone, the part of the axon adjacent to the cell body. When a neuron is at rest, this region's gated channels for sodium and potassium are ____

a. closed b. both open c. both open but inactive d. open only at gated sodium channels e. open only at gated potassium channels

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Inflammatory lesions include ulcers, cellulitis, and ______.

Fill in the blank(s) with the appropriate word(s).

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Exhalation _____

a. is always active b. is always passive c. may be both active and passive d. compresses alveoli e. may be both active and passive, and compresses alveoli

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Imagine you genetically engineered a neuron to produce voltage-gated Na+ and K+ channels that had the same opening times in response to a change in voltage. How would that change the recording above?

A. The peak voltage would be higher. B. The peak would occur over a longer period of time. C. The period of hyperpolarization would be longer. D. No action potential would be generated. E. Threshold values would increase.

Biology & Microbiology